residue error message

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I'm try to use residue function, I get the following error message
[R,P,K] = residue(M.b,M.f); Attempt to reference field of non-structure array. Error in rfdemo (line 171) [R,P,K] = residue(M.b,M.f);
  1 Comment
Walter Roberson
Walter Roberson on 3 Jun 2012
The error means that M is a known variable but is not a structure.

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Accepted Answer

Image Analyst
Image Analyst on 3 Jun 2012
Set a breakpoint there at that line (learn how to use the debugger if you don't know already). Then, when it stops, type M in the command window and hit enter. See what it says. If M is a structure, it will list something like this:
M =
b: 10
f: 'c:\abcdef'
If you see something else (which you probably will), then M is not a structure and you can't do things like M.b and M.f.

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